JPS6267107A - Method for recovering waste heat of hot stove - Google Patents
Method for recovering waste heat of hot stoveInfo
- Publication number
- JPS6267107A JPS6267107A JP60206109A JP20610985A JPS6267107A JP S6267107 A JPS6267107 A JP S6267107A JP 60206109 A JP60206109 A JP 60206109A JP 20610985 A JP20610985 A JP 20610985A JP S6267107 A JPS6267107 A JP S6267107A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- heat exchanger
- hot
- combustion
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、製銑用の高炉に高温の空気を吹き込む熱風炉
から排出される燃焼排ガスの顕熱を回収する方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for recovering sensible heat from combustion exhaust gas discharged from a hot blast furnace that blows high-temperature air into a blast furnace for iron making.
従来の技術
熱風炉は高炉への送風に熱を与えるための蓄熱式熱交操
炉で、熱を菖える蓄熱室と、Ｍ蓄熱室に熱を与える燃焼
室で構成され、通常、高炉１基に対し３〜４基設けられ
る。更に、省エネルギ一対策として熱風炉の排熱すなわ
ち燃焼室から蓄熱室を経て排出される燃焼排ガスの顕熱
を回収するための熱交換器が取り付けられている。Conventional technology A hot-blast furnace is a regenerative heat exchanger furnace that provides heat to the air sent to the blast furnace.It is composed of a heat storage chamber that absorbs heat and a combustion chamber that provides heat to the M heat storage chamber.Normally, one blast furnace is used. 3 to 4 units will be installed for each. Furthermore, as an energy-saving measure, a heat exchanger is installed to recover the exhaust heat of the hot blast stove, that is, the sensible heat of the combustion exhaust gas discharged from the combustion chamber via the heat storage chamber.
第２図は従来の熱風炉の排熱回収方法の一例を示す説明
図である。熱風炉は蓄熱室０）と燃焼室（２）とがそれ
ぞれ独立し、連通管で結合されたいわゆる外燃式熱風炉
で、３基設けられている。FIG. 2 is an explanatory diagram showing an example of a conventional method for recovering exhaust heat from a hot air stove. The hot-blast stove is a so-called external combustion hot-blast stove in which a heat storage chamber 0) and a combustion chamber (2) are each independent and connected by a communicating pipe, and three units are provided.
同図において、各熱風炉の燃焼室（２）で高炉ガス等の
燃料ガスが燃焼し、生成した燃焼ガスは蓄熱室０）へ入
り、該蓄熱室０）内に積まれた多数のれんかに熱を与え
た後太い実線で示した配管経路を通り、熱交換器（４）
を通過して煙突（５）から外気へ放出される。一方、各
熱風炉に付設された燃焼用空気ブ［１ア（３）により送
入された燃焼用空気は細い実線で示した配管経路を通り
、前記熱交換ｉ！ｉｔ （４）に入り、前記燃ｔｊｌ排
ガスから熱を与えられ、燃焼室（２）へ導入される。In the figure, fuel gas such as blast furnace gas is combusted in the combustion chamber (2) of each hot-blast stove, and the generated combustion gas enters the heat storage chamber 0) and is sent to a large number of bricks stacked in the heat storage chamber 0). After applying heat, pass through the piping route shown by the thick solid line to the heat exchanger (4)
It passes through the chimney (5) and is released into the outside air. On the other hand, the combustion air sent by the combustion air vent [1a (3) attached to each hot air stove] passes through the piping route shown by the thin solid line, and passes through the heat exchanger i! It enters the combustion chamber (4), receives heat from the exhaust gas, and is introduced into the combustion chamber (2).
前記蓄熱室（１）内に蓄えられた熱は、送風機（６）に
より該蓄熱室（１）内に導入される高炉への送風に与え
られ、該熱を与えられた送風は熱風として高炉（図示せ
ず）内へ吹き込まれる。各熱風炉においては、蓄熱室内
に熱を蓄えるガス燃焼工程と該蓄熱室を通して高炉へ熱
風を送る送風工程とが所定の時間ごとに交互に繰り返さ
れている。The heat stored in the heat storage chamber (1) is given to the blast furnace introduced into the heat storage chamber (1) by the blower (6), and the blasted air with the heat is sent to the blast furnace (as hot air). (not shown). In each hot-blast stove, a gas combustion process for storing heat in a heat storage chamber and a blowing process for sending hot air to the blast furnace through the heat storage chamber are alternately repeated at predetermined intervals.
従来の熱回収方法としては、−１−記第２図に示したよ
うに燃焼排ガス経路中に熱交換器（４）を１台設置し、
燃焼用空気を予熱するか、あるいは高炉ガス等の燃料を
予熱する方法（図示せず）が用いられていた。As a conventional heat recovery method, one heat exchanger (4) is installed in the combustion exhaust gas path as shown in Figure 2 in -1-.
Methods (not shown) of preheating combustion air or fuel such as blast furnace gas have been used.
発明が解決しようとする問題点
上記のように熱風炉の排ガスが有するＳ！Ｉ′Ｉ熱は熱
風炉の燃焼用空気または燃ｒ１の予熱に用いられている
が、まだ１５０℃程瓜の熱をイ１−シている場合が多く
、未刊用のまま大気中に放散されている。Problems to be Solved by the Invention As mentioned above, the S! I'I heat is used to preheat the combustion air or fuel r1 in a hot stove, but in many cases the heat from the melon is still around 150℃, and it is dissipated into the atmosphere without being used for publication. ing.
問題を解決するための手段
本発明は上記従来の問題を解決することを［ｌ的とする
もので、熱風かの排ガス経路中に２台の熱交換器を直列
に配置し、回収される熱を低沸点熱媒体を用いる発電お
よび前記熱風炉の燃焼用空気または燃料の予熱に使用す
ることを曽旨とする熱風炉の排熱回収方法に関する。Means for Solving the Problem The present invention aims to solve the above-mentioned conventional problems.Two heat exchangers are arranged in series in the hot air exhaust gas path, and the recovered heat is The present invention relates to a method for recovering exhaust heat from a hot blast stove, which is intended to be used for power generation using a low boiling point heat medium and for preheating combustion air or fuel in the hot blast stove.
第１図は本発明を実施するための装置の一例の構成を示
す説明図である。同図において、熱風炉は３基設けられ
、それぞれ蓄熱室（１）と燃焼室（２）で構成されてお
り、燃焼用空気プロア（３）をイｒしている。前記熱風
炉の排ガス経路中に直列に２台の熱交換器（４）、 （
ＩｃＩｌが配置され、燃焼排ガス経路の高温側に配置さ
れた熱交換器（４）（以下第１段熱交換器（４）という
）は弁０１１．Ｑ４１を介して配管により燃焼用空気プ
ロア（３）と連結され、また弁０３．ＯＧおよび温度・
流量検出器Ｏｅを介して配管により燃焼室（２）と連結
されている。FIG. 1 is an explanatory diagram showing the configuration of an example of an apparatus for carrying out the present invention. In the figure, three hot blast furnaces are provided, each consisting of a heat storage chamber (1) and a combustion chamber (2), and feeding a combustion air blower (3). Two heat exchangers (4) in series in the exhaust gas path of the hot blast stove, (
The heat exchanger (4) (hereinafter referred to as the first stage heat exchanger (4)) in which the IcIl is disposed and which is disposed on the high temperature side of the combustion exhaust gas path is connected to the valve 011. It is connected to the combustion air blower (3) by piping via Q41, and is also connected to valve 03. OG and temperature
It is connected to the combustion chamber (2) by piping via a flow rate detector Oe.
一方、排ガス経路の低温側に配置された熱交換器（１■
（以下第２段熱交換器（１〔という）は低沸点熱媒体蒸
発器（′７）、弁０η、Ｏυおよび温度・流量検出器０
１）を有する閉じた配管経路を構成しており、該低沸点
熱媒体蒸発器（７）はタービン（８）および発電機（９
）に連結している。更に前記の第１段熱交換器（４）と
第１段熱交換器Ｏ［Ｉとの間には弁０■を有する配管経
路と弁［相］を仔する配管経路とが設けられている。On the other hand, a heat exchanger (1
(Hereinafter, the second stage heat exchanger (1) is a low boiling point heat medium evaporator ('7), valves 0η, Oυ, and temperature/flow rate detector 0.
1), and the low boiling point heat transfer medium evaporator (7) is connected to a turbine (8) and a generator (9).
). Further, between the first stage heat exchanger (4) and the first stage heat exchanger O[I, a piping route having a valve 0■ and a piping route having a valve [phase] are provided. .
また、同図中破線で示したように送風機（６）から弁０
）を介して蓄熱室（１）へ至る、高炉内へ熱風を吹き込
むための配管経路が設けられている。In addition, as shown by the broken line in the figure, the valve 0 is connected to the blower (6).
) A piping route is provided for blowing hot air into the blast furnace, which leads to the heat storage chamber (1).
作 用
上記のように構成された装置により本発明を実施するに
あたり、基本的な使用方法は第１図における第１段熱交
換器（４）と第１段熱交換器Ｏｎとを結ぶ弁０■および
（至）を閉止し、該第１段熱交換器（４）と第２段熱交
換器（！〔を切り離して使用する方法である。この場合
、燃焼用空気プロア（３）で送入された空気が第１段熱
交換器（４）を通る間に燃焼排ガスの顕熱が該送入空気
に与えられ、該送入空気は予熱された軟融で燃焼室（２
に入る。−・方、第２段熱交換器（ＩＧにおいて、例え
ば温水のような媒体を経路中に流通させると、第１段熱
交換器（４）で未回収の燃焼排ガスの顕熱は、まず温水
に与えられ、該温水の温度を−Ｌ昇させ、ついで低沸点
熱媒体蒸発器（２）で低沸点熱媒体を蒸発させ、タービ
ン（８）を駆動させて電力として回収される。前記低沸
点熱媒体としてはフレオンが用いられる。Operation When carrying out the present invention using the apparatus configured as described above, the basic method of use is to use the valve 0 connecting the first stage heat exchanger (4) and the first stage heat exchanger On in FIG. ■ and (to) are closed, and the first stage heat exchanger (4) and second stage heat exchanger (!) are used separately. In this case, the combustion air is supplied by the combustion air blower (3). While the incoming air passes through the first stage heat exchanger (4), the sensible heat of the combustion exhaust gas is imparted to the incoming air, and the incoming air is preheated and melted into the combustion chamber (2).
to go into. - On the other hand, in the second stage heat exchanger (IG), when a medium such as hot water is passed through the path, the sensible heat of the combustion exhaust gas that has not been recovered in the first stage heat exchanger (4) is first transferred to the hot water. The temperature of the hot water is raised by −L, and then the low boiling point heat medium is evaporated in the low boiling point heat medium evaporator (2), and the turbine (8) is driven to recover it as electric power.The low boiling point Freon is used as the heat medium.
また、回収される熱の燃焼用空気の予熱としての利用よ
りも電力としての利用の割合を増大させ、しかも時間的
な変動のない定まった容量の供給が望まれている場合は
、第１段熱交換器（４）で回収される熱と第１段熱交換
器Ｏ１で回収される熱を混合し、混合比率を制御するこ
とにより一定容量の熱を発電のために供給することがで
きる。すなわち、燃焼用空気プロア（３）で送入した空
気を弁０４および０！Ｉを介して第１段熱交換器（４）
および第２段熱交換器（１１に分割して導入し、第１段
熱交換器（４）を通過してきた前記送入空気の一部を弁
０９を介して燃焼室（２）へ導き、他の一部を弁（至）
を介して、第２段熱交換器（＋（９を通過してきた前記
送入空気と混合し、低沸点熱媒体蒸発器ｑ）へ導き、低
沸点熱媒体であるフレオンを蒸発させ、該フレオンガス
でタービン（８）を駆動し、該タービン（３）で発電機
（９）を駆動する。混合比率の制御は前記送入空気の温
度および流量を第１段熱交換器（４）出口、第２段熱交
換器（ＩＧ出口および混合した後で、経路中に設けた温
度・流量検出器００により測定し、この結果をもとに経
路中に設けた弁（１４１，ａｓ、 ａ力、ａｓ、１２１
の開度を調節することにより行なう。In addition, if it is desired to increase the proportion of the recovered heat used for electricity rather than for preheating combustion air, and to supply a fixed capacity that does not fluctuate over time, the first stage By mixing the heat recovered by the heat exchanger (4) and the heat recovered by the first stage heat exchanger O1 and controlling the mixing ratio, a constant capacity of heat can be supplied for power generation. That is, the air introduced by the combustion air prower (3) is sent to the valves 04 and 0! First stage heat exchanger (4) through I
and the second stage heat exchanger (11), and introduces a part of the air that has passed through the first stage heat exchanger (4) to the combustion chamber (2) through the valve 09, Valve the other part (to)
is introduced into the second stage heat exchanger (+ (mixed with the incoming air that has passed through 9 and guided to the low boiling point heat medium evaporator q), where Freon, which is a low boiling point heat medium, is evaporated, and the Freon gas The turbine (8) is driven by the turbine (3), and the generator (9) is driven by the turbine (3).The mixing ratio is controlled by adjusting the temperature and flow rate of the inlet air to the first stage heat exchanger (4) outlet, After mixing the two-stage heat exchanger (IG outlet and , 121
This is done by adjusting the opening degree.
実 施 例 以下実施例にもとづいて説明する。Example The following will be explained based on examples.
内容積２，７００♂の高炉に付属する外燃式熱風炉３Ｊ
スについて本発明による熱風炉の排熱回収を行なった。External combustion hot blast furnace 3J attached to a blast furnace with an internal volume of 2,700♂
Exhaust heat recovery from a hot-blast stove according to the present invention was carried out for this purpose.
用いた装置は第１図に示した構成を有し、第１段熱交換
器（４）および第２段熱交換器（ｉの間に設けた配管経
路の弁θ］および弁（イ）を閉止し、第１段熱交換器（
４）では燃焼用空気の予熱を、第２段熱交換器（１（Ｉ
では媒体として温水を用い、また低沸点熱媒体としてフ
レオンを用い、第１表記社の諸条件で熱回収を行なった
。また同−条イ／１で、第２図に示す構成を有する従来
の装置で熱回収を行なった。The equipment used has the configuration shown in Figure 1, and includes a first stage heat exchanger (4), a second stage heat exchanger (valve θ in the piping route provided between i), and valve (a). Close the first stage heat exchanger (
4), preheating of the combustion air is performed using the second stage heat exchanger (1(I)
Heat recovery was carried out under the conditions specified by Daiichi Hyoki Co., Ltd. using hot water as a medium and Freon as a low boiling point heat medium. In addition, heat recovery was performed using a conventional device having the configuration shown in FIG. 2 for the same strip A/1.
以上実施した結果を第２表に示す。同表の結果から、本
発明法によれば従来法によっては回収されなかった燃焼
排ガスが有する１２５℃の排熱から１１９にＷの発電量
が得られることがわかる。The results of the above tests are shown in Table 2. From the results in the same table, it can be seen that according to the method of the present invention, a power generation amount of 119 W can be obtained from the 125° C. exhaust heat of the combustion exhaust gas, which was not recovered by the conventional method.
第 １ 表
第 ２ 表
発明の効果
熱風炉の排ガス経路中に２台の熱交換器を直列に配置し
、回収する熱を発電および熱風炉燃焼用空気等の予熱に
利用する本発明により、従来の１台の熱交換器では回収
できなかった比較的低温の熱を、利用しやすい電力とい
うエネルギー形態で、しかも必要な場合には時間的変動
のない定まった容量で回収することができる。これは熱
風炉の熱効率の向上にも寄与し、産業上の有用性は極め
て大きい。Table 1 Table 2 Effects of the invention The present invention, in which two heat exchangers are arranged in series in the exhaust gas path of a hot blast stove, and the recovered heat is used for power generation and preheating of hot blast combustion air, etc. Relatively low-temperature heat, which could not be recovered with a single heat exchanger, can be recovered in the form of energy that is easy to use, in the form of electricity, and, if necessary, in a fixed capacity that does not fluctuate over time. This also contributes to improving the thermal efficiency of hot air stoves, and is extremely useful in industry.
第１図は本発明による熱風炉の排熱回収を実施するため
の装置の一例の構成を示す説明図、第２図は従来の熱風
炉の排熱回収方法の一例の説明図である。
ｌ・・・蓄熱室 ２・・・燃焼室
３・・・燃焼用空気ブロア ４・・・熱交換
器５・・・煙突 ６・・・送風
機７・・・低沸点熱媒体蒸発器 ８・・・ター
ビン９・・・発電機 １０・・・
熱交換器１１、 ＋２．１３．１４． ＋５．１７．１
８．１９．２０・・・弁１６・・・温度自流量検出器
出 願 人 住友金属工業株式会社
手続補正書（方式）
昭和６０年１２月２日
１、事件の表示
昭和６０年 特許願 第２０６１０９号２ 発明の名称
熱風炉の排熱回収方法
３、補正をする者
事件との関係 出願人 ≠μ零−甲大阪市東区
北浜５丁目１５番地
（２１１）住友金属工業株式会社
４、代理人
５、補正指令の日付 昭和６０年１１月２６１６、補正
により増加する発明の数 、−一、
ｔ。
１、本願明細書１頁４行〜２頁１行の
Ｕ２３発明の名称
（１）熱風炉の排ガス・・・・・・・・・・・・・・・
・・・・・・方法。
（２） 前記２台の・・・・・・・・・・・・・・・
・・・・・・・・・・・・方法。
（３）前記２台の・・・・・・・・・・・・排熱回収方
法。」を次のとおり補正する。
［２、特許請求の範囲
（１）熱風炉の排ガス経路中に２台の熱交換器を直列に
配置し、回収される熱を低沸点熱媒体を用いる発電およ
び前記熱風炉の燃焼用空気または燃料の予熱に使用する
ことを特徴とする熱風炉の排熱回収方法。
（２） 前記２台の熱交換器のうち、熱風炉の排ガス
経路の高！Ｉｍｆご配置した熱交換器で回収される熱を
燃焼用空気または燃料の予熱に、低温側に配置した熱交
換器で回収される熱を低沸点熱媒体を用いる発電に使用
する特許請求の範囲第１項ｆｉ３ｅの熱風炉の排熱回収
方法。FIG. 1 is an explanatory diagram showing the configuration of an example of a device for recovering exhaust heat from a hot-blast stove according to the present invention, and FIG. 2 is an explanatory diagram of an example of a conventional method for recovering exhaust heat from a hot-blast stove. l... Heat storage chamber 2... Combustion chamber 3... Combustion air blower 4... Heat exchanger 5... Chimney 6... Air blower 7... Low boiling point heat medium evaporator 8...・Turbine 9... Generator 10...
Heat exchanger 11, +2.13.14. +5.17.1
8.19.20...Valve 16...Temperature self-flow rate detector Application Person: Sumitomo Metal Industries Co., Ltd. Procedural amendment (method) December 2, 1985 1, Indication of case 1985 Patent application No. No. 206109 No. 2 Name of the invention Method for recovering exhaust heat from a hot blast stove 3 Relationship with the amended case Applicant ≠ μ Zero - Ko Osaka City, Higashi-ku, Kitahama 5-15 (211) Sumitomo Metal Industries Co., Ltd. 4, Agent 5. Date of amendment order: November 2616, 1985. Number of inventions increased by amendment: -1.
t. 1. Name of the U23 invention on page 1, line 4 to page 2, line 1 of the specification (1) Exhaust gas from hot air stove...
······Method. (2) The above two machines...
············Method. (3) Exhaust heat recovery method for the two units. ' shall be amended as follows. [2. Claims (1) Two heat exchangers are arranged in series in the exhaust gas path of the hot blast stove, and the recovered heat is used for power generation using a low boiling point heat medium and for combustion air of the hot blast stove or A method for recovering exhaust heat from a hot air stove, characterized in that it is used for preheating fuel. (2) Of the two heat exchangers mentioned above, the height of the exhaust gas path of the hot stove! Claims that the heat recovered by the heat exchanger placed on the IMF is used to preheat combustion air or fuel, and the heat recovered by the heat exchanger placed on the low temperature side is used for power generation using a low boiling point heat medium. Item 1: Method for recovering exhaust heat from a hot air stove according to fi3e.
Claims (3)
配置し、回収される熱を低沸点熱媒体を用いる発電およ
び前記熱風炉の燃焼用空気または燃料の予熱に使用する
ことを特徴とする熱風炉の排熱回収方法。(1) Two heat exchangers are arranged in series in the exhaust gas path of the hot air stove, and the recovered heat is used for power generation using a low boiling point heat medium and for preheating the combustion air or fuel of the hot air stove. A method for recovering exhaust heat from a hot blast stove.
の高温側に配置した熱交換器で回収される熱を燃焼用空
気または燃料の予熱に、低温側に配置した熱交換器で回
収される熱を低沸点熱媒体を用いる発電に使用する特許
請求の範囲第１項記載の熱風炉の排熱回収方法。(2) Of the two heat exchangers, the heat exchanger placed on the high temperature side of the exhaust gas path of the hot stove uses the heat recovered by the heat exchanger to preheat the combustion air or fuel, and the heat exchanger placed on the low temperature side 2. The method for recovering exhaust heat from a hot-blast stove according to claim 1, wherein the heat recovered is used for power generation using a low boiling point heat medium.
の高温側に配置した熱交換器で回収される熱の一部また
は全部を低温側に配置した熱交換器で回収される熱と混
合し、低沸点熱媒体を用いる発電に使用する特許請求の
範囲第１項記載の熱風炉の排熱回収方法。(3) Of the two heat exchangers, some or all of the heat recovered by the heat exchanger placed on the high temperature side of the exhaust gas path of the hot air stove is recovered by the heat exchanger placed on the low temperature side. The method for recovering exhaust heat from a hot air stove according to claim 1, which is mixed with heat and used for power generation using a low boiling point heat medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60206109A JPS6267107A (en) | 1985-09-17 | 1985-09-17 | Method for recovering waste heat of hot stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60206109A JPS6267107A (en) | 1985-09-17 | 1985-09-17 | Method for recovering waste heat of hot stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6267107A true JPS6267107A (en) | 1987-03-26 |
Family
ID=16517948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60206109A Pending JPS6267107A (en) | 1985-09-17 | 1985-09-17 | Method for recovering waste heat of hot stove |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6267107A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053701C (en) * | 1997-01-24 | 2000-06-21 | 冶金工业部鞍山热能研究院 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
| CN112696963A (en) * | 2020-12-07 | 2021-04-23 | 中国恩菲工程技术有限公司 | Low-temperature waste heat recovery system of smelting flue gas acid making system |
-
1985
- 1985-09-17 JP JP60206109A patent/JPS6267107A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053701C (en) * | 1997-01-24 | 2000-06-21 | 冶金工业部鞍山热能研究院 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
| CN112696963A (en) * | 2020-12-07 | 2021-04-23 | 中国恩菲工程技术有限公司 | Low-temperature waste heat recovery system of smelting flue gas acid making system |
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